I would love to see a tower defense game that places a visible path through my house (with the ability to either use the Custom Home Creator loadout or randomly generate house objects within cubes) and I have to set little tower models in the environment to attack critters on the path. The path could be of a specified length, and winding back and forth if there's not much floor space. The towers could include an arrow type that increases range if placed on top of a cube, a troop deployment type that has to be placed on the floor, and an air defense type that attaches to walls or the sides of cubes. To increase player interaction, dead critters could toss currency that the player has to pick up. Currency is used to purchase new towers or upgrade existing towers to increase speed, damage, or number of troops/attacks.